LaurenceR:
Upon compilation, it shows that I am occupying alot of memory space with these combined sketches.(86% PROGRAM STORAGE SPACE and 90% DYNAMIC MEMORY)
This is also troublesome as I would like to add my tft display to show information from the data on the display which I know would occupy a fair amount of memory in addition to this.
So 90% of memory used already and you need to add in the memory to hold the NMEA strings.
However since the important detail of which Arduino you are using has been redacted, so the forum cannot advice specifically, but at 90% for whats allready loaded, it looks like a UNO.
Forget it, you need a Arduino with more memory, your chances of adding in the dispaly library are close to zero.